Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Adjustment	Common Stock	Other Capital	Other Capital Adjustment	Treasury Stock	Retained Earnings	Retained Earnings Adjustment	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2021			80.1
Beginning balance at Dec. 31, 2021	$ 523.3	$ (6.6)	$ 8.0	$ 578.1	$ (5.6)	$ (64.4)	$ 102.6	$ (1.0)	$ (101.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27.8						27.8
Amortization of net actuarial (gains) losses and prior service costs, net of income taxes	5.2								5.2
Repurchase of shares for withholding taxes under equity plans (in shares)			(0.1)
Repurchase of shares for withholding taxes under equity plans	(4.3)			(4.3)
Stock-based compensation and shares issued under equity plans (in shares)			0.3
Stock-based compensation and shares issued under equity plans	4.5			4.5
Ending balance (in shares) at Mar. 31, 2022			80.3
Ending balance at Mar. 31, 2022	$ 549.9		$ 8.0	572.7		(64.4)	129.4		(95.8)
Beginning balance (in shares) at Dec. 31, 2022	80.7		80.7
Beginning balance at Dec. 31, 2022	$ 541.3		$ 8.0	507.2		(63.0)	176.6		(87.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27.8						27.8
Amortization of net actuarial (gains) losses and prior service costs, net of income taxes	(0.6)								(0.6)
Adjustment to dividends	0.4						0.4
Repurchase of shares for withholding taxes under equity plans (in shares)			(0.2)
Repurchase of shares for withholding taxes under equity plans	(14.1)			(14.1)
Stock-based compensation and shares issued under equity plans (in shares)			0.1
Stock-based compensation and shares issued under equity plans	$ 8.0		$ 0.1	7.9
Ending balance (in shares) at Mar. 31, 2023	80.6		80.6
Ending balance at Mar. 31, 2023	$ 562.8		$ 8.1	$ 501.0		$ (63.0)	$ 204.8		$ (88.1)